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Unless you are going with one of AS/Trane, or Carrier's, high end heat pump outdoor units, I wouldn't bother with their air handlers that have the hydronic heating coil option.
They are expensive, and depending on your heating capacity requirement, may require a coil that mounts on top of the air handler, rather than inserting within it, making the installed height very tall.
I haven't looked at the Carrier air handler, but AS/Trane has 2 configurations of hydronic coils for their air handlers. The ones that fit inside the cabinet are more for use as supplemental heat for the heat pump, and may not have enough capacity to be the only heat source in a cold climate.
For applications where more capacity is needed, they have a coil that fits neatly on top of the air handler, but they make an already tall air handler into a ridiculously tall one.

There are a number of companies that make decent air handlers with built in DX cooling and hydronic heating coils, with or without and integrated pump, and with variable speed blowers.
First Company air handlers are the most available in my area, but they are a number of brands available in different regions.